TECHNICAL FIELD
[0001] The present invention relates to a display strip for arranging and attaching a plurality
of product-enclosed bags thereto for the display.
BACKGROUND ART
[0002] Some products such as snack foods are generally sold in pillow packages (vertical
pillow, horizontal pillow) manner. In many cases, product-enclosed bags are arranged
and sold on display racks in stores. However, in such cases, each and every bag had
to be placed on the racks by hand, and the display place for sale was restricted to
the given racks.
[0003] A known display method for product sale, called strip bag display requires no display
rack. The strip bag display provides, as shown in Fig. 1, an arrangement in which
a plurality of products are attached to a tape material with a prescribed width, called
a display strip, and suspended. This display form needs no display rack and enables
display and sale at any place, such as a place beside a register of a store, and a
front desk area of a hotel.
[0004] Conventionally, as a display strip, those to which product-enclosed bags are attached
by pressure sensitive adhesive force of the pressure sensitive adhesive tapes, such
as those which comprise pressure sensitive adhesive tapes or those which are produced
by previously punching holes in prescribed positions of tapes made of paper or resins
and attaching pressure sensitive adhesive tapes from the rear face sides, have been
employed. Such display strips are advantageous in that products can be attached again
after once attached products are detached.
[0005] However, these display strips had a problem that it was difficult to automate a step
of attaching product-enclosed bags to the display strips by an apparatus. That is,
in the case it was tried to automate the attachment step for the display strips while
the pressure sensitive adhesive tapes being exposed, the display strips were stuck
to rollers and the like in passing through an apparatus to make it impossible to feed
tapes as desired. On the other hand, in the case the pressure sensitive adhesive faces
were covered with releasing sheets and the like, the work of attaching products consequently
became complicated to make the automation difficult. Further, there was another problem
that dust and stains were stuck to the surfaces of the adhesive tapes to worsen the
appearance.
[0006] Against this problem, a display strip, of which a heat seal layer is formed on one
side, is proposed so that product-enclosed bags may be directly attached by heat sealing.
With such display strips, it is very easy to continuously automate a series of steps
of attaching the product-enclosed bags to the display strips and enclosing a product
in a bag. However, such heat seal type display strips required a sealer and the like
for attaching products again after products were detached and it was difficult to
work this for stores.
SUMMARY OF THE INVENTION
[0007] In view of the state of the art, it is an object of the present invention to provide
a display strip with which a step of attaching product-enclosed bags thereto can easily
be automated and once detached product-enclosed bags can be easily bonded again.
[0008] The present invention provides a display strip for arranging and attaching a plurality
of product-enclosed bags for the display, which comprises at least a substrate layer
and a sealant layer, the sealant layer being bondable to a surface layer of the bag
by thermocompression bonding and having no pressure sensitive adhesive property before
the thermocompression bonding, but being bondable to the bag again owing to exposure
of a pressure sensitive adhesive face in the case of peeling of the bag bonded by
thermocompression bonding.
[0009] It is preferable that the sealant layer contains a heat activated pressure sensitive
adhesive and has a layered structure of two or more layers and it is more preferable
that at least, the outermost layer is a heat activated pressure sensitive adhesive
layer containing the heat activated pressure sensitive adhesive and an inner side
layer of the heat activated pressure sensitive adhesive layer is a pressure sensitive
adhesive layer having the pressure sensitive adhesive property at normal temperature.
In addition, it is preferable that the heat activated pressure sensitive adhesive
contains a thermoplastic resin with a second transition temperature of -10 to 70°C
and a solid plasticizer with a melting point of 70 to 120°C and it is more preferable
that the heat activated pressure sensitive adhesive further contains a tackifier.
[0010] It is preferable that the sealant layer has a layered structure of two or more layers
and at least the outermost layer is a heat seal layer containing a thermofusible resin
having no heat activated pressure sensitive adhesive property at normal temperature
and an inner side layer of the heat seal layer is a pressure sensitive adhesive layer
having the pressure sensitive adhesive property at normal temperature. The pressure
sensitive adhesive layer having the pressure sensitive adhesive property at normal
temperature is preferable to contain a rubber pressure sensitive adhesive or an acrylic
pressure sensitive adhesive. In this case, the heat seal layer is preferable to have
a thickness of the 20 µm or less.
[0011] The substrate layer is preferable to comprise biaxial oriented polypropylene, biaxial
oriented polyethylene terephthalate, metal, paper, or these laminates.
[0012] The bag is preferable to comprise at least the sealant layer and the substrate layer.
The sealant layer is preferable to comprise at least one selected from a group consisting
of polypropylene, a copolymer of propylene and any other olefin, and low density polyethylene
and the sealant layer is preferable to comprise a heat-sealable biaxial oriented polypropylene
film. The sealant layer and the substrate layer are preferable to be laminated via
an adhesive. The sealant layer and the substrate layer are preferable to be laminated
via an intermediate layer and the sealant layer and the intermediate layer are more
preferable to be laminated via an adhesive.
[0013] A display strip and product assembly, which is obtainable by bonding the display
strip and a product-enclosed bag by heat sealing is also one of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014]
Fig. 1 is a schematic view showing a strip bag display.
Fig. 2 is a schematic view showing an example of the step of attaching product-enclosed
bags to the display strip of the present invention.
[0015] In the drawings, reference numeral 1 represents a display strip; 2 represents a product-enclosed
bag; and 3 represents a sealed site.
DETAILED DESCRIPTION OF THE INVENTION
[0016] Hereinafter, the present invention will be described in detail.
[0017] A display strip of the present invention comprises at least a substrate layer and
the sealant layer can be bonded to the surface of a product-enclosing bag by thermocompression
bonding.
[0018] With respect to the display strip of the present invention, the sealant layer has
no pressure sensitive adhesive property before bonding by thermocompression bonding
and thus it can easily be subjected to an automated apparatus but in the case the
bag bonded by thermocompression bonding is detached, the pressure sensitive adhesive
face is exposed to make it possible to bonding the bag again thereto.
[0019] Such a display strip is not particularly limited and examples of the display strip
may include a display strip, for example, having a sealant layer containing a heat
activated pressure sensitive adhesive (a first embodiment); a display strip having
a sealant layer having a layered structure of two or more, the outermost layer being
a heat seal layer containing a thermofusible resin having no pressure sensitive adhesive
property at normal temperature and the inner side layer of the heat seal layer being
a pressure sensitive adhesive layer having the pressure sensitive adhesive property
at normal temperature (a second embodiment).
[0020] The display strip of the first embodiment of the present invention has a sealant
layer containing a heat activated pressure sensitive adhesive. In this description,
the heat activated pressure sensitive adhesive means an adhesive having the characteristic
that the adhesive has no pressure sensitive adhesive property before being heated
but has the pressure sensitive adhesive property by being heated and maintains the
pressure sensitive adhesive property developed once even after the temperature is
turned back to normal temperature. Such an adhesive is also called as a delayed tack
pressure sensitive adhesive. As the delayed tack pressure sensitive adhesive, those
descried in US Patent No. 4091162 and the like may be employed.
[0021] The heat activated pressure sensitive adhesive is not particularly limited and those
containing a thermoplastic resin with a second transition temperature of -10 to 70°C
and a solid plasticizer with a melting point of 70 to 120°C are preferable to be used.
Such a type of the heat activated pressure sensitive adhesive develops the pressure
sensitive adhesive property by plasticizing the thermoplastic resin by solid plasticizer
which is melted by heating.
[0022] The thermoplastic resin with a second transition temperature of -10 to 70°C is not
particularly limited and examples are acrylic polymers such as acrylic acid ester-methacrylic
acid ester copolymers; vinyl acetate type polymers, synthetic rubber, and natural
rubber. Examples of the acrylic polymers are copolymers of alkyl acrylic ester having
an alkyl group of 2 to 10 carbon atoms and alkyl methacrylate ester having an alkyl
group of 1 to 4 carbon atoms.
[0023] The solid plasticizer with a melting point of 70 to 120°C is not particularly limited
and examples of the solid plasticizer are dicyclohexyl phthalate, bis(cis-3,3,5-trimethylcyclohexyl)
phthalate, and resorcinol bis [di (2,6-dimethylphenyl) phosphate].
[0024] The heat activated pressure sensitive adhesive containing the thermoplastic resin
and the solid plasticizer is further preferable to further contain a tackifier. Addition
of the takifier may increase the pressure sensitive adhesive property developed by
heating.
[0025] The tackifier is not particularly limited and examples are terpene resins, aliphatic
petroleum resins and coumarone-indene resins.
[0026] As the heat activated pressure sensitive adhesive, other than the heat activated
pressure sensitive adhesive containing the thermoplastic resin and the solid plasticizer,
for example, heat activated pressure sensitive adhesives obtained by polymerizing
monomer mixtures comprising butyl acrylate, 2-ethylhexyl acrylate, acrylonitrile,
and N-methylolacrylamide in the presence of copolymers comprising methyl methacrylate,
styrene, acrylic acid can be used.
[0027] Among the heat activated pressure sensitive adhesives, those which are commercially
available are, for example, "Arontack" manufactured by Toagosei Chemical Industry
Co., Ltd.; "Ecobrid" manufactured by Daicel Chem. Ind., Ltd.; and "Heatmagic" manufactured
by Toyo Ink Mfg. Co., Ltd. and the commercially available heat activated pressure
sensitive adhesives are selected from among these products.
[0028] With respect to the display strip of the first embodiment of the present invention,
the sealant layer may be only a layer containing the heat activated pressure sensitive
adhesive. In this case, when a bag is peeled from the display strip to which bags
are attached, the pressure sensitive adhesive is not transferred to the bag side and
the bag can be bonded again to the pressure sensitive adhesive remaining on the display
strip.
[0029] In the case the display strip has a sealant layer with a layered structure of two
or more layers, it is preferable that at least the outermost layer is a heat activated
pressure sensitive adhesive layer containing the heat activated pressure sensitive
adhesive and a layer in the inner side of the heat activated pressure sensitive adhesive
layer is a pressure sensitive adhesive layer having the pressure sensitive adhesive
property at normal temperature. Owing to such a structure, the pressure sensitive
adhesive force of the pressure sensitive adhesive layer of the inner layer is added
to the pressure sensitive adhesive property of the heat activated pressure sensitive
adhesive developed by heating and therefore, even if the weight of a product enclosed
in a bag is heavy, the bag may reliably be held.
[0030] The pressure sensitive adhesive composing the pressure sensitive adhesive layer having
the pressure sensitive adhesive property at normal temperature is not particularly
limited and examples are rubber type pressure sensitive adhesives containing natural
rubber, synthetic rubber and the like; and solvent type, emulsion type or hot-melt
type acrylic pressure sensitive adhesives containing acrylic acid esters and the like.
As the rubber pressure sensitive adhesives, a polyisobutyrene type pressure sensitive
adhesive, a butyl rubber type pressure sensitive adhesive, and a block copolymer type
pressure sensitive adhesive can be exemplified.
[0031] The display strip of the first embodiment of the present invention is capable of
bonding a product-enclosed bag thereto by pressure sensitive adhesive property of
the heat activated pressure sensitive adhesive developed by thermocompression bonding
with the bag since the sealant layer contains the heat activated pressure sensitive
adhesive. Since the sealant layer has no pressure sensitive adhesive property before
heating, the step of the thermocompression bonding of the bag can easily be automated.
Further, since the pressure sensitive adhesive property once developed may be maintained
even after the temperature is turned back to normal temperature, even if the attached
bag is detached, the bag can be bonded again.
[0032] With respect to the display strip of the second embodiment of the present invention,
the sealant layer has a layered structure of two or more layers and the outermost
layer is a heat seal layer containing a thermofusible resin having no heat activated
pressure sensitive adhesive property at normal temperature and the inner side layer
of the heat seal layer is a pressure sensitive adhesive layer having the pressure
sensitive adhesive property at normal temperature.
[0033] The thermofusible resin having no heat activated pressure sensitive adhesive property
at normal temperature is not particularly limited and at least one resin selected
from a group consisting of polypropylene, copolymers of propylene and any other olefins,
low density polyethylene and ethylene-vinyl acetate copolymers is preferable. Addition
of at least one resin selected from a group consisting of polypropylene, copolymers
of propylene and any other olefins, low density polyethylene and ethylene-vinyl acetate
copolymers to the heat seal layer provides an excellent heat seal property with heat-sealable
biaxial oriented polypropylene (OPH), which is presently employed widely for sealant
layers in the surfaces of many bags in Europe and US. Particularly, those containing
polypropylene or copolymers of polypropylene and any other olefins as main components
and mixed with low density polyethylene or ethylene-vinyl acetate copolymers for lowering
the melting point are more preferable. In addition, the low density polyethylene also
includes straight chain polyethylene obtained by polymerization using a single site
catalyst or a Ziegler catalyst.
[0034] Since the heat seal layer has no pressure sensitive adhesive property at normal temperature,
it also has a function as a mask layer for covering the pressure sensitive adhesive
layer. By having such a mask layer, the display strip of the second embodiment of
the present invention has no pressure sensitive adhesive property before heating and
therefore, the step of the thermocompression bonding of the bag can easily be automated.
[0035] By having the pressure sensitive adhesive layer having the pressure sensitive adhesive
property at normal temperature, the display strip of the second embodiment of the
present invention is provided with the pressure sensitive adhesive force of the pressure
sensitive adhesive layer in addition to the bonding force between the display strip
and a bag by heat sealing, and therefore, even if the weight of the product enclosed
in the bag is heavy, the bag may reliably be held. Further, in the case the once bonded
bag is detached, the pressure sensitive adhesive layer in the inner side is exposed
to make bonding of the bag again possible.
[0036] The thickness of the heat seal layer is preferable to be sufficiently thin relative
to the thickness of the pressure sensitive adhesive layer of the inner side having
the pressure sensitive adhesive property at normal temperature. The upper limit of
the thickness of the heat seal layer is preferably 20 µm. If it is more than 20 µm,
in the case the once bonded bag is detached, the pressure sensitive adhesive layer
of the inner side is not exposed and it is sometimes made impossible to bond the bag
again.
[0037] In the pressure sensitive adhesive layer having the pressure sensitive adhesive property
at normal temperature, as the component for providing the pressure sensitive adhesive
property, a rubber type pressure sensitive adhesive or acrylic pressure sensitive
adhesive to be used as the pressure sensitive adhesive component of the heat activated
pressure sensitive adhesive can be used.
[0038] Since the heat seal layer exists in the surface, it is no need to positively add
a solid plasticizer to the pressure sensitive adhesive layer having the pressure sensitive
adhesive property at normal temperature, however the solid plasticizer may be added
to an extent that the aim of the present invention is not inhibited. In the case the
solid plasticizer is contained in the pressure sensitive adhesive layer having the
pressure sensitive adhesive property at normal temperature, it has no pressure sensitive
adhesive property at normal temperature before the heat sealing is carried out, however
it has the pressure sensitive adhesive property at normal temperature after the heat
sealing. However, to obtain the pressure sensitive adhesive property as high as possible
at normal temperature, it is preferable to contain no solid plasticizer.
[0039] Since the display strip of the second embodiment of the present invention comprises
the sealant layer with the structure, a product-enclosed bag can be bonded to the
display strip easily by heat sealing. Since the sealant layer has no pressure sensitive
adhesive property before heating, it is no need to insert a release film and the step
of the heat sealing of the bag can easily be automated. Further, in the case a bonded
bag is detached, the heat seal layer is broken and the pressure sensitive adhesive
layer of the inner side is exposed, so that the bag can be bonded again.
[0040] With respect to the display strip of the present invention, the sealant layer may
be formed substantially on the entire face of the display strip or may be formed only
on prescribed positions where products are to be attached. In the case it is formed
substantially on the entire face of the display strip, products can be attached to
any positions of the display strip and therefore, it is preferable. Additionally,
the word, substantially, means that the position where a punching is carried out,
the peripheral parts where no product can be attached and the like are excluded.
[0041] The substrate layer is not particularly limited, however it is preferable for the
substrate layer to have sufficiently high strength since it is hung while many products
being attached thereto and have heat resistance high enough to prevent melting or
deterioration at the time of thermocompression bonding and for example, biaxial oriented
polypropylene (OPP), biaxial oriented polyethylene terephthalate, metal foil, paper,
or these laminates, and also paper coated with resin components and the like are preferable.
[0042] The thickness of the substrate layer is not particularly limited, however it is preferable
to be 30 to 200 µm. If it is less than 30 µm, no sufficient strength can be obtained
and it may possibly result in breakage at the time of display or detachment of a product-enclosed
bag. If it is more than 200 µm, the substrate layer works as a heat insulator to inhibit
sufficient heat conduction to the sealant layer at the time of thermocompression bonding.
[0043] The display strip of the present invention may have a layer which guarantees other
functions between the substrate layer and the sealant layer. One example of such a
layer is a printing layer. Particularly, in the case a polymer is used as the substrate
layer, it is preferable to form the printing layer between the substrate layer and
the sealant layer and in the case the substrate layer is made of paper, the printing
is preferably carried out on the face other than the paper-layered face.
[0044] The shape of the display strip of the present invention is not particularly limited
and a tape shape and a sheet shape can be exemplified. Further, at one end of the
display strip of the present invention, a hole may be punched for hanging on a hook,
or a clip and the like may be attached, for the display by hanging the display strip
to which the products are attached. Particularly, since the punching step can easily
be carried out during a series of automated step, it is preferable. But, when the
display strip is hung on the hook through the punched hole, the portion around the
hole tends to undergo stress and to be broken. Therefore, the substrate layer may
be reinforced or those having a polyethylene layer or a nylon layer between the substrate
layer and the sealant layer may be used.
[0045] As the bag for enclosing a product to be attached to the display strip of the present
invention, any commonly used bag can be used and above all, those which comprise at
least a sealant layer and a substrate are preferable. The sealant layer on the surface
of the bag preferably comprises at least one selected from a group consisting of polypropylene,
a copolymer of propylene and any other olefin, low density polyethylene, and an ethylene-vinyl
acetate copolymer. The sealant layer on the surface of the bag preferably comprises
a heat-sealable biaxial oriented polypropylene (OPH) film. The heat-sealable biaxial
oriented polypropylene (OPH) film generally refers to a biaxial oriented polypropylene
(OPP) film that is made heat-sealable with a very thin terpolymer layer formed thereon,
which comprises a heat-sealable resin such as a propylene-ethylene-butene ternary
copolymer. It is often adopted for a bag material particularly in the Europe and US.
[0046] The sealant layer and the substrate layer composing the bag enclosing a product are
preferable to be laminated via an adhesive. Lamination via an adhesive gives high
interlayer adhesive force and therefore the bag is not broken in the interlayer when
the bag is detached from the display strip of the present invention and rather, breakage
tends to occur in the interface between the display strip and the bag or in the inside
of the display strip.
[0047] The sealant layer and the substrate layer composing the bag enclosing a product may
be laminated via an intermediate layer. In this case, the sealant layer and the intermediate
layer are preferable to be laminated via an adhesive. Since lamination of the sealant
layer and the intermediate layer via an adhesive gives high interlayer adhesive force,
the bag is not broken in the interlayer when the bag is detached from the display
strip of the present invention and rather, breakage tends to occur in the interface
between the display strip and the bag or in the inside of the display strip.
[0048] Such a bag enclosing a product may be produced by coextruding a heat-sealable polymer
and a polymer for forming the substrate layer or by coating a heat-sealable polymer
such as a hot melt adhesive on the substrate layer.
[0049] As the bags for enclosing products to be attached to the display strip of the present
invention, examples are those comprise biaxial oriented polypropylene (OPP) layer/print
layer/adhesive layer/polyethylene (PE) layer/aluminum vapor-deposited polyethylene
terephthalate (PET) layer/polyethylene (PE) layer/cast polypropylene (CPP) layer;
biaxial oriented polypropylene (OPP) layer/print layer/ polyethylene (PE) layer/aluminum
vapor-deposited polyethylene terephthalate (PET) layer/polyethylene (PE) layer/cast
polypropylene (CPP) layer; biaxial oriented polypropylene (OPP) layer/print layer/aluminum
vapor-deposited cast polypropylene (CPP) layer; biaxial oriented polypropylene (OPP)
layer/print layer/polyethylene (PE) layer/aluminum vapor-deposited cast polypropylene
(CPP) layer; transparent, evaporated deposited, biaxial oriented polyethylene terephthalate
(PET) layer/print layer/cast polypropylene (CPP) layer; heat-sealable biaxial oriented
polypropylene (OPH) layer/print layer/ polyethylene (PE) layer/aluminum vapor-deposited
heat-sealable biaxial oriented polypropylene (OPH) layer; heat-sealable biaxial oriented
polypropylene (OPH) layer/print layer/polyethylene (PE) layer/aluminum vapor-deposited
cast polypropylene (CPP) layer; and heat-sealable biaxial oriented polypropylene (OPH)
layer/print layer/adhesive layer/polyethylene (PE) layer/aluminum vapor-deposited
cast polypropylene (CPP) layer.
[0050] A method for producing the display strip of the present invention is not particularly
limited and a conventionally known coating method can be employed. For example, a
method for forming the sealant layer by applying a heat activated pressure sensitive
adhesive and the like in a prescribed thickness to the substrate layer by gravure
coating or calendar coating can be exemplified. Depending on the thickness of the
sealant layer, the same resin may be applied a plurality of times of coating.
[0051] In the case the sealant layer has two or more layers, after a pressure sensitive
adhesive having the pressure sensitive adhesive property at normal temperature is
applied to the substrate layer, the heat activated pressure sensitive adhesive and
the like is applied further on it. Further, in the case the outermost layer is masked,
after the pressure sensitive adhesive is applied to the substrate layer, a film of
polypropylene, low density polyethylene, ethylene-vinyl acetate resin and the like
to be used as a mask agent is laminated.
[0052] In the case the sealant layer is formed by coating the heat activated pressure sensitive
adhesive layer and in the case the pressure sensitive adhesive having the pressure
sensitive adhesive property at normal temperature is applied, they may be applied
respectively in a range preferably 10 to 200 g/m
2 and more preferably 30 to 100 g/m
2.
[0053] The method for attaching product-enclosing bags to the display strip of the present
invention is not particularly limited and for example, it is preferable to attach
the bags according to the step shown in Fig. 2. In this step, at first, product-enclosing
bags are placed in a manner that the front side of the bag is in contact with the
display strip and the upper parts of the bags are heat sealed to the display strip
(Fig. 2a). When a prescribed number of product-enclosing bags are bonded to the display
strip, the each product-enclosing bag turned upside down about the axis of the heat-sealed
parts so as to set the front faces of the bags on the opposite to the display strip
(Fig. 2b). In this state, when one end of the display strip is hung on a hook and
the like for display, the attached portion between the bag and the display strip is
in a state as shown in Fig.2c, so that the each product-enclosing bag may easily be
detached from the display strip with a small force by pulling the bags downward.
[0054] The bonding strength between the bag and the display strip is not particularly limited
and it is preferably from 1 to 30 N/15 mm. If it is less than 1 N/15 mm, the products
may fall under its own weight depending on the weights of the products and if it is
more than 30 N/15 mm, even if the suspended bags with the products enclosed are pulled,
the bags may not be detached. It is more preferably from 5 to 20 N/15 mm.
[0055] Use of the display strip of the present invention makes it possible to easily fix
product-enclosing bags by thermocompression bonding and and easily attach a large
quantity of products thereto by automation. Also, even if a product-enclosing bag
is detached from the display strip, the bag may be attached again to the display strip.
BEST MODES FOR CARRYING OUT THE INVENTION
[0056] The present invention will be more described in detail by Examples, however it is
not intended that the present invention is limited to these Examples.
(Example 1)
[0057] A heat activated pressure sensitive adhesive (Heatmagic DW 1040W, manufactured by
Toyo Ink Mfg. Co., Ltd.) was applied in a coating amount of 30 g/m
2 to a 50 µm-thick biaxial oriented polypropylene film by a bar coater and dried at
40°C for 4 minutes by a drier. After the obtained laminate was aged at normal temperature
for 1 day, it was cut in 35 mm width to obtain a display strip. No pressure sensitive
adhesive property was observed in the surface of the obtained display strip.
(Example 2)
[0058] A heat activated pressure sensitive adhesive (Arontack TT-1225, manufactured by Toagosei
Co., Ltd.) is applied in a coating amount of 40 g/m
2 to a polyethylene (PE) layer of laminate paper, which was obtained by laminating
the PE in a 30 µm thickness on paper with a thickness of 50 g/m
2, by a bar coater and dried at 40°C for 10 minutes by a drier. After the obtained
laminate was aged at normal temperature for 1 day, it is cut in 35 mm width to obtain
a display strip. No pressure sensitive adhesive property is observed in the surface
of the obtained display strip.
(Example 3)
[0059] A heat activated pressure sensitive adhesive (Ecobrid TM-120, manufactured by Daicel
Chem. Ind., Ltd.) was applied in a coating amount of 50 g/m
2 to a 75 µm-thick biaxial oriented polypropylene film by a bar coater and dried at
40°C for 10 minutes by a drier. After the obtained laminate was aged at normal temperature
for 1 day, it was cut in 35 mm width to obtain a display strip. No pressure sensitive
adhesive property was observed in the surface of the obtained display strip.
(Example 4)
[0060] A heat activated pressure sensitive adhesive (Ecobrid TM-100, manufactured by Daicel
Chem. Ind., Ltd.) is applied in a coating amount of 30 g/m
2 to the paper face of laminate paper, which is obtained by dry laminating paper with
a thickness of 40 g/m
2 on a 12 µm-thick biaxial oriented polyethylene terephthalate film, by a bar coater
and dried at 40°C for 10 minutes by a drier. After the obtained laminate is aged at
normal temperature for 1 day, it is cut in 35 mm width to obtain a display strip.
No pressure sensitive adhesive property is observed in the surface of the obtained
display strip.
(Example 5)
[0061] A butyl rubber type pressure sensitive adhesive having the pressure sensitive adhesive
property at normal temperature is applied in a coating amount of 30 g/m
2 to a 50 µm-thick biaxial oriented polyethylene terephthalate film by a bar coater
and dried at 40°C for 4 minutes by a drier. After the obtained film is aged at normal
temperature for 1 day, a 20 µm-thick layer of linear low density polyethylene polymerized
with a single site catalyst is further laminated on the pressure sensitive adhesive
layer. The obtained laminate is cut in 35 mm width to obtain a display strip. No pressure
sensitive adhesive property is observed in the surface of the obtained display strip.
(Example 6)
[0062] After an anchor coat layer was applied on a 50 µm-thick biaxial oriented polyethylene
terephthalate film, low density polyethylene with a thickness of 13 µm was laminated
by extrusion lamination. A butyl rubber type pressure sensitive adhesive was applied
in a coating amount of 30 g/m
2 to the low density polyethylene face by a bar coater and dried at 40°C for 4 minutes
by a drier. After the obtained film was aged at normal temperature for 1 day, an ethylene-vinyl
acetate resin layer with a thickness of 5 µ was laminated further on the pressure
sensitive adhesive layer. The obtained laminate is cut in 35 mm width to obtain a
display strip. No pressure sensitive adhesive property is observed in the surface
of the obtained display strip.
(Comparative Example 1)
[0063] A 20 µm-thick layer of low density polyethylene polymerized with a metallocene was
laminated on a 50 µm-thick biaxial oriented polypropylene film. The obtained laminate
was cut in 35 mm width to obtain a display strip. No pressure sensitive adhesive property
was observed in the surface of the obtained display strip.
(Comparative Example 2)
[0064] An acrylic pressure sensitive adhesive having the pressure sensitive adhesive property
at normal temperature was applied in a thickness of 20 µm to a 50 µm-thick biaxial
oriented polypropylene film and the obtained laminate was cut in 35 mm width to obtain
a display strip.
(Evaluation)
[0065] The display strips produced in Examples and Comparative Examples were evaluated in
the handling property, the adhesive property, and the re-adhesive property according
to the following methods. The results were shown in Table 1.
(1) Evaluation of Handling Property
[0066] Each of the obtained display strips was supplied to a strip bag apparatus provided
with an automatic tape feeding mechanism by rollers and whether the display strip
could smoothly be sent or not was evaluated according to the following standards.
○: fed smoothly
×: clogged at roller part to make smooth feeding impossible
(2) Evaluation of Adhesive Property
[0067] Using a strip bag apparatus, a bag material was bonded by thermocompression bonding
in conditions of seal temperature 195°C and seal time 250 msec to produce bonded samples.
With respect to each bonded sample cut in 15 mm width, the seal strength was measured
at 300 mm/min pulling rate using a tensile strength tester (Strograph V1-C, Toyo Seiki
Seisaku-Sho, Ltd.). As the bag material, a film of sealable OPP/ink/polyethylene/sealable
OPP in the order from the surface in the total thickness of 50 µm was used.
(3) Evaluation of Re-adhesive Property
[0068] Using a strip bag apparatus, a bag material was bonded by thermocompression bonding
in conditions of seal temperature 195°C and seal time 250 msec to produce bonded samples.
After the bag material was peeled from bonded samples, packaging bags containing 50
g content were again bonded by thermocompression bonding and observed while being
kept in hung state for 24 hours. The test was carried out using 10 specimens of each
bonded sample and the number of the packaging bags dropping in 24 hours was counted.
Table 1
|
Handling property |
Sealstrength (N/15mm) |
Number of dropping bags in 24 hours |
Example1 |
○ |
5.7 |
1 |
Example3 |
○ |
8.5 |
0 |
Comparative Example1 |
○ |
7.5 |
Re-adhesion was impossible. |
Comparative Example2 |
× |
- |
- |
INDUSTRIAL APPLICABILITY
[0069] In accordance with the present invention, it is possible to provide a display strip
with which the step of attaching a product-enclosed bag is easily automated and a
product-enclosed bag is easily bonded again after the bag is once detached.
1. A display strip for arranging and attaching a plurality of product-enclosed bags for
the display,
which comprises at least a substrate layer and a sealant layer,
the sealant layer being bondable to a surface layer of the bag by thermocompression
bonding and having no pressure sensitive adhesive property before the thermocompression
bonding, but being bondable to the bag again owing to exposure of a pressure sensitive
adhesive face in the case of peeling of the bag bonded by thermocompression bonding.
2. The display strip according to claim 1,
wherein the sealant layer contains a heat activated pressure sensitive adhesive.
3. The display strip according to claim 2,
wherein the sealant layer has a layered structure of two or more layers and at
least the outermost layer is a heat activated pressure sensitive adhesive layer containing
a heat activated pressure sensitive adhesive and an inner side layer of the heat activated
pressure sensitive adhesive layer is a pressure sensitive adhesive layer having the
pressure sensitive adhesive property at normal temperature.
4. The display strip according to claim 2 or 3,
wherein the heat activated pressure sensitive adhesive contains a thermoplastic
resin with a second transition temperature of -10 to 70°C and a solid plasticizer
with a melting point of 70 to 120°C.
5. The display strip according to claim 4,
wherein the heat activated pressure sensitive adhesive further contains a tackifier.
6. The display strip according to claim 1,
wherein the sealant layer has a layered structure of two or more layers and at
least the outermost layer is a heat seal layer containing a thermofusible resin having
no pressure sensitive adhesive property at normal temperature and an inner side layer
of the heat seal layer is a pressure sensitive adhesive layer having the pressure
sensitive adhesive property at normal temperature.
7. The display strip according to claim 6,
wherein the pressure sensitive adhesive layer having the pressure sensitive adhesive
property at normal temperature contains a rubber pressure sensitive adhesive or an
acrylic pressure sensitive adhesive.
8. The display strip according to claim 6 or 7,
wherein the heat seal layer has a thickness of 20 µm or less.
9. The display strip according to claim 1, 2, 3, 4, 5, 6, 7 or 8,
wherein the substrate layer comprises biaxial oriented polypropylene, biaxial oriented
polyethylene terephthalate, metal, paper, or these laminates.
10. The display strip according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9,
wherein the bag comprises at least the sealant layer and the substrate layer.
11. The display strip according to claim 10,
wherein the sealant layer comprises at least one selected from a group consisting
of polypropylene, a copolymer of propylene and any other olefin, and low density polyethylene.
12. The display strip according to claim 10,
wherein the sealant layer comprises a heat-sealable biaxial oriented polypropylene
film.
13. The display strip according to claim 10, 11 or 12,
wherein the sealant layer and the substrate layer are laminated via an adhesive.
14. The display strip according to claim 10, 11 or 12,
wherein the sealant layer and the substrate layer are laminated via an intermediate
layer.
15. The display strip according to claim 14,
wherein the sealant layer and the intermediate layer are laminated via an adhesive.
16. A display strip and product assembly,
which is obtainable by bonding the display strip according to claim 1, 2, 3, 4,
5, 6, 7, 8, 9, 10, 11, 12, 13 or 14 and a product-enclosed bag by heat sealing.